This is Shadowflame V2.
How he got to Kardas Nui:He heard that there was a great Treasure that will give any being immortality and he needed it to keep it safe from The Makuta that was hunting for the item.he traveled to the island but crashed.he survived

This is his Custom arm design
This is his legs(Slighty Custom)
His Torso
the side of the torso
the back(where his mega jetpack is)
his Mutation form(his jetback are also his wings and tail)
Creator's note
well i like making the custom parts and it was good to remake Shadowflame